The original design of the sand clock was modified to fit a laser module running on 3 - 5 V. A push button allows starting the time writing sequence at will rather than at a preset interval.
Additional to the push button, a PIR sensor triggers a writing sequence every time a person is detected in front of the clock.
An acrylic stand holds the clock in an upright position for use on a desk. The mounting holes in the base plate allow also for wall mounting if preferred.
The kit comes with all parts required: all acrylic parts assembled in three pre-cut plates, an acrylic stand, glow in the dark sticker material, laser module, three servo motors, an Arduino Uno + shield, PIR sensor, pushbutton, wire and heat shrink tubing, brass spacer, a power supply, USB cable and small mounting hardware.
The software for the laser plot clock is available as an Arduino sketch for download. For programming the Uno and first-time calibration of the servo motors you need a computer with the Arduino IDE installed. A detailed construction manual is available for download.